Archaeological North Arrow
thingiverse
The Archaeological North Arrow is used in photographs to show both orientation as well as metric scale (10 cm, 10 one cm, and 1 four cm) in unit excavations. In other words, this is used to show the size and orientations of archaeological photographs. The accuracy of the scale is within 0.3 mm and with some printer calibration, you can probably improve the accuracy. I whipped this up on Fusion360 because I was reluctant to pay 20 bucks for something I could make for a fraction of the cost.
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